attorn vs hand over

attorn

verb
  • To transfer one's obligations from a person to another person. 

  • To consent to the transfer of one's obligations as tenant under a lease to a new landlord. 

  • To acknowledge the jurisdiction of (a particular court) over one's dispute. 

hand over

verb
  • To deliver (someone to an enemy, police, etc.). 

  • To relinquish control or possession of something to someone. 

How often have the words attorn and hand over occurred in a corpus of books? (source: Google Ngram Viewer )